Powers:Jaspers could effortlessly warp reality on a dimension-wide scale, the effects limited only by his insane imagination; only the Fury proved immune. Jaspers' warp spready at an exponetially increasing rate. It engulfed the 238 continuum in days, and took that reality's destruction to prevent that warp spreading across the multiverse; this extreme measure would not have stopped the more powerful Earth-616 Jaspers. Jaspers can transform himself, but only when he has other material available to work with; denied reality to manipulate, he is powerless. He is a scientific genius.

Bio:Captain Britain first encountered him when he travelled to an alternative temporal reality with Jackdaw. They interrupted a bank robbery being perpetrated by the "Crazy Gang", a criminal group themed around characters from Alice in Wonderland with Jaspers taking the role of The Hatter.

It later emerged that, before indulging in a campaign of mayhem, Jaspers was a member of Parliament who successfully campaigned for the outlawing of superheroes. He then created The Fury, a highly adaptable android created to exterminate superheroes. Within two years all the superhumans of the world had been killed by the Fury, many of them referencing classic British comic characters like Marvelman and the Steel Claw. The only surviving superhero of this world, Captain UK, had fled to Earth-616 and abandoned her heroic identity. However, the Fury was programmed not to kill Jaspers, who himself had the ability to warp reality to his will, at the cost of his own sanity.

The Fury was reactivated by Jaspers and later succeeded in killing both Captain Britain and Jackdaw. Captain Britain was then removed from Earth-238 by Merlyn and revived on Earth-616. The Fury, somehow detecting this, adapted itself to travel between realities.

Saturnyne and her Avant Guard attempted to give Earth-238 "the Push", an evolutionary boost when Jaspers unleashed the Jaspers' Warp, a wave of unreality that affects everything in the continuity. Fearing contamination, Saturnyne's temporary replacement, Mandragon, destroyed the Earth-238 continuity, and presumably Jaspers along with it.

Upon returning to his own reality, Captain Britain found that another Sir James Jaspers was leading an anti-superhero campaign, with the aid of Henry Peter Gyrich and Sebastian Shaw (suggesting that Jaspers is a member of the Hellfire Club). Jaspers later won a landslide general election victory on his anti-superhero platform and became Prime Minister. Events mirrored those of Earth-238 and Jaspers unleashed the Jaspers' Warp upon London. The Fury arrived on Earth-616 and attacked Jaspers after recognising that this Jaspers was not the same man it was forbidden to kill. After a reality-warping battle, The Fury managed to kill him by teleporting the pair outside of the universe, where Jaspers had no reality to control and was thus powerless. The Fury then, in its weakened condition, was destroyed itself by the one hero that had escaped from Earth-238, Captain UK. Although Saturnyne took a sample of Jaspers' DNA with the intention of cloning him, the DNA was secretly destroyed by Merlyn's daughter, Roma.

Sir James Jaspers later appears as an anti-mutant prosecutor during the trial of Magneto. However it's not stated whether this is the revived mutant Jaspers, a clone, or some lasting effect of the reality warp.

Some years later, a large-scale reality warp originating on Earth-616 resulted in the recreation of the exterminated Earth-616 Jaspers and Fury as a single combined being. It is unknown if Mad Jim Jaspers retained his mutant powers after the M-Day.